 The work I presented today is about the connections between monetary policy and fiscal policy, that is, policy about taxes and spending by the government. The determination of the price level and inflation, which we regard as the central role of monetary policy, actually depends also on how taxes and spending by governments are being implemented. Understanding the connections between fiscal policy and monetary policy requires sophisticated models, some of them as complicated as any that arise in the natural sciences. So there is a contribution to be made by technically trained economists who understand the science of these kinds of models, and also by people who try to bring the insights from these models down to the practical level that can be used by monetary policy makers.